WO2015091066A1

WO2015091066A1 - Hand-held grinder

Info

Publication number: WO2015091066A1
Application number: PCT/EP2014/076911
Authority: WO
Inventors: Dirk Röck; Udo Panzer; Nazim Sabuncuoglu
Original assignee: Flex-Elektrowerkzeuge Gmbh
Priority date: 2013-12-19
Filing date: 2014-12-08
Publication date: 2015-06-25
Also published as: CN105899330A; EP3083139B1; EP3083139A1; US10035236B2; US20170021471A1; DE102013114469A1; CN105899330B

Abstract

The object of the invention is to produce a hand-held grinder with a robust design, which is easy and ergonomic to use. To achieve this, according to the invention the hand-held grinder comprises a holder for holding the grinder, a drive motor and a tool head, the tool head being movably arranged on the holder by means of a moving device. Said tool head can be pivoted in relation to the holder about one or more pivoting axes and the distance of the tool head from the holder can be varied by means of the moving device.

Description

Hand held grinding machine

The present invention relates to a hand-held grinding machine, in particular a so-called long-necked sander.

A hand-held grinder is for example from the

DE 10 2005 021 153 AI known.

The present invention has for its object to provide a hand-held grinding machine, which is robust and easy and convenient to handle.

This object is achieved by a hand-held grinding machine, which comprises a holding device for holding the grinding machine, a drive motor and a tool head, wherein the tool head is movably arranged by means of a moving device on the holding device, wherein by means of the moving device of the tool head relative to the holding device to one or more pivot axes is pivotable and wherein by means of the movement device, a distance of the tool head of the holding device is variable.

Characterized in that according to the invention by means of a movement device, a pivoting movement of the tool head relative to the holding device and a variation of the distance of the tool head are provided by the holding device, occurring during use of the grinding machine disturbing forces are preferably minimized, so that the grinding machine preferably has an increased stability and is easy and convenient for a user to handle.

In one embodiment of the invention, it is provided that by means of the movement device by pivoting the tool head to one or a plurality of pivot axes of the distance of the tool head of the holding device is variable. The pivoting movement of the tool head about one or more pivot axes causes and / or preferably causes the variation of the distance of the tool head from the holding device.

It can be provided that by means of the movement device, a distance of a arranged on a fork element bearing point of the tool head of a distal end of the holding device is variable.

It can be advantageous if the movement device comprises a rotation device for pivoting the tool head about one or more

Swivel axes and a displacement device for moving the tool head relative to the holding device comprises.

In particular, it can be provided that the tool head is linearly displaceable relative to the holding device.

Preferably, one or more pivot axes of the tool head are parallel displaceable by means of the displacement device.

In one embodiment of the invention can be provided that the movement device comprises a displacement device for displacing the tool head relative to the holding device, wherein the displacement device is preferably integrated in a fork element of the grinding machine.

It may be favorable if the grinding machine comprises a coupling device for positive coupling of the pivoting movement of the tool head with the movement of the tool head for changing the distance from the holding device.

For example, it can be provided that the movement device designed as a gear device and / or rack device coupling device for positive coupling of the pivoting movement of the tool head with the movement of the tool head for changing the distance from the holding device comprises.

It can be provided, for example, that the gear device arranged on the tool head, in particular rotatably connected to a pivot ring of the tool head, is.

The rack device is then arranged in particular on a fork element arranged on the holding device and / or integrated into the fork element arranged on the holding device.

By means of a coupling device for positive coupling of the pivoting movement of the tool head with the movement of the tool head to change the distance from the holding device can be particularly effected that each change in the pivot alignment of the tool head causes a change in the distance of the tool head of the holding device.

It may be favorable if the movement device comprises a guide device, in particular a guide channel, along which the tool head for changing the distance from the holding device is displaceable.

In particular, it can be provided that the movement device comprises a guide device, in particular a guide channel, along which the tool head for changing the distance from the holding device is substantially linearly displaceable.

The guide channel is in particular a guide slot or a guideway.

In a further embodiment of the invention can be provided that the movement device comprises a multi-joint device which has two or more parallel axes of rotation. For example, it can be provided that the movement device comprises a multi-joint device, which has three, four or more parallel axes of rotation.

The axes of rotation of the multi-joint device are not necessarily pivot axes of the tool head. Rather, preferably by means of the axes of rotation, in particular by means of a plurality of axes of rotation, together one or more pivot axes of the tool head can be realized. In particular, it can be provided that a virtual pivot axis of the tool head, that is, a pivot axis of the tool head, which does not extend through a shaft or mounting or mounting of the tool head, is provided by means of a plurality of rotation axes of a multi-joint device.

The axes of rotation of the moving device are preferably axes about which in each case at least one component of the multi-joint device, but not necessarily the tool head, is rotatable.

By means of a multi-joint device, preferably, a displacement of the tool head along a guide device can be achieved.

The multi-joint device may preferably form a rotary device for pivoting the tool head about one or more pivot axes and / or a displacement device for displacing the tool head relative to the holding device or be a component thereof.

In one embodiment of the invention, it is provided that the multi-joint device is a positively coupled multi-joint device in which a change in an angular position of a joint of the multi-joint device causes a change in an angular position of another joint of the multi-joint device, in particular all other joints of the multi-joint device. In particular, it can be provided that the same change in the angular position of the one joint always causes the same change in the angular position of the other or all other joints.

In particular, by means of a positively coupled multi-joint device can preferably be effected that a pivoting of the tool head about one or more pivot axes simultaneously leads to a targeted change in the distance of the tool head of the holding device.

It can be provided that the movement device comprises a lever device, by means of which the tool head is pivotable in predetermined pivot orientations, in particular depending on an angular position of the joints of a multi-joint device and / or depending on a displacement position of the tool head relative to the holding device.

The object underlying the present invention is further achieved by a hand-held grinding machine which comprises, alternatively or in addition to the above-mentioned features: a holding device for holding the grinding machine, a drive motor and a tool head, wherein the tool head by means of a moving device movable on the holding device is arranged, wherein a tool holder of the tool head is coupled by means of a transmission shaft to the drive motor, wherein the grinding machine comprises at least one connection device for torque transmitting connection of the transmission shaft to the drive motor and / or to the tool holder of the tool head, wherein the connection device comprises a one-way clutch for torque transmission in only one direction of rotation.

An overrunning clutch is in particular an overrunning clutch.

Preferably, torsional vibrations can be decoupled by means of an overrunning clutch. In particular, by means of an overrunning clutch preferential be cause that a vibration of a tool holder can not be transferred back to the transmission shaft.

Furthermore, the object underlying the present invention can be achieved by means of a hand-held grinding machine which comprises, alternatively or in addition to the features described above: a holding device for holding the grinding machine, a drive motor and a tool head, wherein the tool head by means of a moving device movable on the Holding device is arranged, wherein a tool holder of the tool head is coupled by means of a transmission shaft to the drive motor, wherein the grinding machine comprises two shaft receptacles for receiving two ends of the transmission shaft and / or two ends of a sheath of the transmission shaft, wherein at least one end of the transmission shaft and / or at least one end of the casing is movable relative to the associated shaft holder.

In particular, it may be provided that at least one end of the transmission shaft and / or at least one end of the casing is displaceable relative to the associated shaft receptacle, for example linearly displaceable.

The transmission shaft and / or the sheath is preferably flexible, elastic and / or resilient.

At least one end of the transmission shaft and / or at least one end of the casing is preferably movable along a main extension direction of the transmission shaft in a region of the associated shaft receptacle relative to the associated shaft receptacle.

The sheath and the transmission shaft are preferably displaceable relative to each other. Furthermore, it can be provided that the casing and / or the transmission shaft can be displaced relative to only one or relative to both shaft receptacles.

In one embodiment of the invention it can be provided that a shaft receptacle is arranged on the tool head and / or a shaft receptacle is arranged on a distal end of a substantially tubular rod of the holding device.

In particular, the grinding machine comprises a substantially tubular rod having a proximal end and a distal end, wherein the drive motor is preferably disposed at the proximal end and wherein the tool head is preferably located at the distal end.

It may be favorable if the grinding machine comprises a transmission shaft which connects the drive motor for torque transmission with a tool holder of the tool head and runs at least in sections within the tubular rod.

A connection device for the torque-transmitting connection of the transmission shaft to the drive motor and / or to the tool holder of the tool head preferably comprises at least one transmission, for example a reduction gear, a sun gear and / or a planetary gear.

The tool holder and a tool receiving end facing the transmission shaft preferably have at least approximately a common axis of rotation. This axis of rotation is preferably pivotable together with the tool head by means of the movement device about one or more pivot axes. In particular, the tool holder and the tool holder facing the end of the transmission shaft are pivotable together with the tool head about one or more pivot axes.

An end of the transmission shaft facing away from the tool head is preferably not pivotally connected to the holding device.

By pivoting the tool head thus results in particular a bending of the transmission shaft and / or the casing.

The deformation states (bending states) of the transmission shaft and / or the sheathing which are different relative to the holding device at different pivot orientations (pivot positions) relative to the holding device can impair the stability and / or the user-friendliness of the grinding machine when the sheath and / or the transmission shaft are rigidly connected to lead. In particular, by varying the distance of the tool head from the holding device during pivoting of the tool head, by an overrunning clutch for transmitting torque in only one direction of rotation and / or by a movable recording of the transmission shaft and / or the sheath these negative aspects can be preferably avoided or at least mitigated.

A tool which can be received and / or received by means of the tool holder can be driven in particular in a rotating, oscillating and / or eccentric manner.

Furthermore, the hand-held grinding machine according to the invention may have one or more of the features and / or advantages described below:

A sliding element, in particular a tube made of a polytetrafluoroethylene material (PTFE material), can be arranged between the transmission shaft and the sheathing, in particular a friction between the one shown in FIG Operation of the grinding machine rotating transmission shaft and the stationary shell to minimize.

The tool head is by means of the movement device about at least one pivot axis, preferably in an angular range of at least about 80 °, preferably at least about 90 °, for example about 100 °, pivotable.

The tool head is preferably displaceable by at least approximately 20 mm, for example by at least approximately 30 mm, in particular linearly displaceable.

The movement device preferably comprises at least two components which are toothed with one another and, in the case of a pivoting of the same relative to one another, at the same time bring about a displacement of the same relative to one another.

In one embodiment of the invention, by means of an overrunning clutch, a drive shaft, in particular the transmission shaft, from an output shaft, in particular an output shaft rotatably connected to the tool holder of the tool head, decoupled. Torsional vibrations which are caused in particular by the flexible transfer shaft prestressed by the torque transmission can hereby preferably be reduced.

Preferably, by means of the movement device, a continuous and / or automatic change in the distance of the tool head from the holding device during pivoting of the tool head relative to the holding device can be realized.

The grinding machine according to the invention preferably enables a longer service life of the transmission shaft, since, in particular, larger bending radii result and the course of the casing is consequently more straightforward. Preferably, a friction between the transmission shaft and the sheath can be reduced, so that at the tool holder and the tool disposed thereon with the same output power, a greater effective power can be provided.

In particular, when a forceful pushing away of the sheath during bending thereof can be avoided, the movement device can enable a smooth pivoting of the tool head relative to the holding device.

Finally, the grinding machine preferably still allows a better grinding result, in particular in that the pivoting of the tool head relative to the holding device is not or only slightly affected by the bending of the transmission shaft and / or the casing.

In particular, when at least one end of the transmission shaft and / or at least one end of the casing is movable relative to an associated shaft receiving, preferably a movement margin for the transmission shaft and / or the sheath can be created to one at different pivot positions (pivot alignments) of the tool head To compensate for excess length of the transmission shaft and / or the sheath and / or compensate.

By means of such a length adaptation, bending radii of the transmission shaft and / or the sheathing can preferably be increased and thus the service life of the transmission shaft and the flexibility of the tool head on a surface to be machined can be significantly optimized.

Preferably, the movement of the casing and / or the transmission shaft relative to the holding device and / or relative to the tool head without upsetting, without kinks and / or without tight bending radii. The movement of the at least one end of the transmission shaft and / or the at least one end of the casing relative to the associated shaft receiving preferably takes place due to the inherent rigidity of the transmission shaft and / or the casing and due to the pivotal movement of the tool head relative to the holding device.

Alternatively or additionally, however, it can also be provided that a positive drive is provided, by means of which at least one end of the transmission shaft and / or at least one end of the casing is movable relative to the associated shaft receptacle, in particular into the shaft receptacle or out of the shaft receptacle, is.

Further preferred features and / or advantages of the invention are the subject of the following description and the drawings of exemplary embodiments.

In the drawings show:

Fig. 1 is a schematic perspective view of a first embodiment of a hand-held grinding machine, in which a pivotable tool head is provided;

Figure 2 is a schematic partially transparent side view of a second embodiment of a grinding machine, in which a tool head is provided, which is pivotally and simultaneously linearly displaceable by means of a gear device and a rack device.

FIG. 3 is a schematic representation corresponding to FIG. 2 of the grinding machine of FIG. 2, wherein the tool head is arranged in an alternative pivoting position; FIG. 4 is a schematic representation corresponding to FIG. 2 of the grinding machine of FIG. 2, wherein the tool head is arranged in a further alternative pivoting position;

5 is an enlarged view of the area V in FIG. 3;

6 a of FIG. 2 corresponding schematic representation of a third

Embodiment of a grinding machine, in which a hinge device and a guide device for pivoting and moving the tool head are provided;

FIG. 7 is a schematic representation corresponding to FIG. 6 of the grinding machine of FIG. 6, wherein the tool head is arranged in an alternative pivoting position;

FIG. 8 is a schematic representation corresponding to FIG. 6 of the grinding machine of FIG. 6, wherein the tool head is arranged in a further alternative pivoting position;

9 is an enlarged view of the area IX in FIG. 7;

Fig. 10 is a corresponding to Fig. 2 schematic representation of a fourth

Embodiment of a grinding machine, in which a multi-joint device and a lever device for pivoting and moving the tool head are provided;

FIG. 11 is a schematic representation corresponding to FIG. 10 of the grinding machine of FIG. 10, wherein the tool head is arranged in an alternative pivoting position;

FIG. 12 is a schematic representation corresponding to FIG. 10 of the grinding machine of FIG. 10, wherein the tool head is arranged in a further alternative pivoting position; 13 shows a schematic vertical cross section through a tool head of a fifth embodiment of a grinding machine, in which a transmission shaft of the grinding machine is connected by means of an overrunning clutch with a tool holder of the tool head.

14 is a schematic vertical longitudinal section through a sixth embodiment of a grinding machine in which a transmission shaft of the grinding machine and / or a sheathing of the transmission shaft are movable relative to shaft seats of the grinding machine;

FIG. 15 is a schematic representation corresponding to FIG. 14 of the grinding machine of FIG. 14, wherein the tool head is arranged in an alternative pivoting position; and

FIG. 16 is a schematic representation corresponding to FIG. 14 of the grinding machine of FIG. 14, wherein the tool head is arranged in a further alternative pivoting position.

Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

A first embodiment shown in FIG. 1 of a hand-held grinding machine designated as a whole by 100 is used, for example, for the surface treatment of walls, floors and ceilings.

Such a grinding machine 100 is in particular a so-called long-necked sander.

The grinding machine 100 comprises a holding device 102 for holding the grinding machine 100, a drive motor 104 for driving a machine tool. zeugs 106 and a tool head 108, on which the tool 106 can be arranged or arranged.

The holding device 102 comprises in particular a handle 110 and a tubular rod 112.

The tubular rod 112 is formed, for example, as a tubular member 114.

On the tubular rod 112 on the one hand, the drive motor 104 and on the other hand, the tool head 108 is arranged.

The drive motor 104 is arranged at a proximal end 116 of the tubular rod 112.

The tool head 108 is movably disposed by means of a moving device 118 at a distal end 120 of the tubular rod 112.

In particular, the grinding machine 100 includes a fork member 122 which is secured to the distal end 120 of the tubular rod 112 and which serves to movably receive the tool head 108.

On the fork element 122, for example, a pivot ring 124 of the movement device 118 is arranged pivotably about a pivot axis 126.

The tool head 108 in turn is preferably arranged pivotably about a further pivot axis 126 on the pivot ring 124.

The two pivot axes 126 are preferably aligned perpendicular to each other. The swivel ring 124 and the tool head 108 are arranged, in particular at least in sections, between two fork arms 127 of the fork element 122.

In the in Fig. 1, the moving device 118 includes a pivoting device 128 formed by means of the pivoting ring 124.

The tool head 108 is therefore in particular pivotable relative to the holding device 102, in particular relative to the tubular rod 112.

To transmit a drive movement, in particular a torque, from the drive motor 104 to the tool 106, the grinding machine 100 comprises an at least partially flexible transmission shaft 130 which is surrounded by a sheath 132 and thus protected.

The transmission shaft 130 is guided in particular in the casing 132.

The transmission shaft 130 is rotatably coupled at one end to the drive motor 104 and the other end with a tool holder 134 for receiving the tool 106.

In this way, torque can be transmitted from the drive motor 104 to the tool 106 arranged on the tool holder 134.

The first embodiment of grinding machine 100 shown in FIG. 1 functions as follows:

During operation of the grinding machine 100, that is to say when using the same for machining surfaces, the tool 106 is placed flat on a surface to be machined. Depending on the position of the user relative to the surface and the manner in which the user holds the grinding machine 100, a pivotal orientation or pivotal position of the tool head 108 relative to the retainer 102, particularly relative to the tubular rod 112, results ,

The portions of the transmission shaft 130 and the sheath 132, which extend between the holding device 102 and the tool head 108 are bent differently depending on the respective pivot position and thus loaded differently. In particular, this different bending can lead to an undesirable influence on the service life of the grinding machine 100 and / or an undesirable influence on the handling comfort of the grinding machine 100.

It may therefore be advantageous if by means of the movement device 118 not only a pivoting movement of the tool head 108 can be performed, but at the same time the different bending of the transmission shaft 130 and / or the sheathing 132 resulting from the pivoting of the tool head 108 can be compensated for or otherwise taken into account.

In a second embodiment of a hand-held grinding machine 100 shown in FIGS. 2 to 5, it is therefore provided that the movement device 118 comprises a displacement device 138 in addition to a rotation device 136 for rotating or pivoting the tool head 108 about the pivot axes 126.

By means of the displacement device 138, the tool head 108 can in particular be displaced linearly.

In this case, the tool head 108 is in particular displaced relative to the holding device 102, in particular relative to the tubular bar 112. A distance A of the tool head 108 preferably changes from the holding device 102, in particular from the tubular rod 112.

As in particular the Fig. 2 to 4 can be seen, the tool head 108 by means of the displacement device 138 in different pivot positions and at the same time different displacement positions can be arranged.

In particular, two bearing points 140, in which the pivot ring 124 is mounted on the fork arms 127 of the fork element 122, move at different pivot positions of the tool head 108 relative to the distal end 120 of the tubular rod 112 of the holding device 102nd

The distance A of the bearing points 140 from the distal end 120 of the tubular rod 112 is thus variable.

For supporting the swivel ring 124 on the fork element 122, in the second embodiment of the grinding machine 100 shown in FIGS. 2 to 5, two pins 142 are provided which project in opposite directions from the swivel ring 124 and engage in guide channels 144 of the fork element 122.

In particular, a respective guide channel 144 is provided in each fork arm 127 of the fork element 122.

The guide channels 144 are substantially linear guide channels 144, so that the pins 142 together with the tool head 108 are substantially linearly displaceable relative to the fork element 122 and thus relative to the holding device 102 of the grinding machine 100.

By means of the guide channels 144 and the pin 142, a guide device 146 of the grinding machine 100 is formed. In particular, the pins 142 and the guide channels 144 form the displacement device 138 for displacing the tool head 108 relative to the holding device 102.

As in particular Fig. 5, the moving device 118 in the embodiment of the grinding machine 100 shown in FIGS. 2 to 5 comprises a gear device 148 and a rack device 150. The gear device 148 comprises in particular a gear element 152, which at least over a portion of its circumference with projections 154 is provided.

The rack device 150 in particular comprises a toothed rack element 156, which comprises substantially linearly successively arranged projections 154.

The protrusions 154 of the gear member 152 are preferably engageable with the protrusions 154 of the rack member 156.

By rotation of the gear element 152, a displacement of the gear element 152 relative to the rack element 156 can thus be effected.

The gear element 152 and the rack element 156 are thus coupling elements 158 of a coupling device 160, by means of which the pivotal movement of the tool head 108 and the displacement movement of the tool head 108 are positively coupled.

A pivoting of the tool head 108 thus always leads to a displacement of the tool head 108 relative to the holding device 102 and vice versa.

As can be seen in particular from FIG. 5, the rack element 156 is arranged in particular on the fork arm 127 of the fork element 122. Preferably, the rack member 156 is integrated with the fork arm 127 of the fork member 122.

It may be favorable if each fork arm 127 comprises a rack element 156 or is provided with a rack element 156.

The gear member 152 is in particular rotatably arranged on the pivot ring 124.

Preferably, two gear members 152 are provided, which are each associated with a rack member 156 on each fork arm 127.

As in particular from a comparison of FIG. 2 to 4 with each other, the tool head 108 is pivotable by more than approximately 90 °, while along the guide channel 144 slidably.

In the two swivel end positions (see FIGS. 2 and 4), the tool head 108 is simultaneously arranged in the two displacement end positions.

Due to the fact that the distance A between the tool head 108 and the tubular rod 112 of the holding device 102 can be varied by means of the displacement device 138 of the movement device 118 when the tool head 108 is pivoted, the bending load of the transmission shaft 130 and / or the casing 132 be reduced.

This increases the longevity of the hand-held grinding machine 100 and the handling convenience of using the same.

Incidentally, the in Figs. 2-5 illustrated second embodiment of the grinding machine 100 in terms of structure and function with the in FIG. 1, so that reference is made to the above description thereof. A third embodiment of a hand-held grinding machine 100 shown in FIGS. 6 to 9 essentially differs from the second embodiment shown in FIGS. 2 to 5 in that the coupling device 160 is not provided by gear elements 152 and rack elements 156 but by an articulation device 162 is formed.

The articulated device 162 is in particular a multi-articulated device 164, which comprises a plurality of joints 166.

By means of the joints 166 of the multi-joint device 164, a plurality of components 168 of the multi-joint device 164 are preferably rotatable and / or pivotable about rotation axes 170 aligned parallel to one another.

The multi-joint device 164 comprises, for example, two components 168.

One of the components 168 is arranged, for example, rotatably about an axis of rotation 170 on the fork element 122.

This component 168 is connected by means of a hinge 166 to a further component 168 of the multi-joint device 164, which in turn is rotatably or rotatably mounted on the pivot ring 124 of the movement device 118.

Corresponding to the second embodiment of the grinding machine 100 shown in FIGS. 2 to 5 is also in the in Figs. 6 to 9 illustrated third embodiment provided that the pivot ring 124 comprises two pins 142 which engage in guide channels 144.

The guide channels 144 are also arranged in the fork arms 127 of the fork member 122, but aligned at a different angle relative to the extension direction of the fork arm 127. As in particular the Fig. 6 to 8 can be seen, the pivoting movement and the displacement movement of the tool head 108 are forcibly coupled to each other in the third embodiment of the grinding machine 100.

For this purpose, one of the components 168 of the multi-joint device 164 is rotatably connected to the pivot ring 124, so that the tool head 108 is always linearly displaced along the guide channel 144 during pivoting thereof due to the limited by the multi-joint device 164 freedom of movement.

Incidentally, the third embodiment of the hand-held grinding machine 100 shown in FIGS. 6 to 9 is the same in construction and function as the second embodiment shown in FIGS. 2 to 5, so that reference is made to the above description thereof.

A fourth embodiment of a hand-held grinding machine 100 shown in FIGS. 10 to 12 differs from that shown in FIGS. 6 through 9, essentially in that the multi-joint device 164 comprises four joints 166 and a lever device 171.

Already by means of the four joints 166 and the lever device 171 on the one hand, the pivotal movement of the tool head 108 and on the other hand, the variation of the distance of the tool head 108 can be realized by the holding device 102.

In the fourth embodiment of the grinding machine 100 shown in FIGS. 10 to 12, a displacement device 138 with a guide channel 144 is thus preferably dispensable.

Incidentally, the in Figs. 10 to 12 illustrated fourth embodiment of the hand-held grinding machine 100 in terms of structure and radio tion with the in Figs. 6 to 9 illustrated third embodiment, so that reference is made to the above description thereof in this regard.

One in Fig. 13 illustrated fifth embodiment of a hand-held grinding machine 100 includes an advantageous connection device 172 for connecting the transmission shaft 130 to the tool holder 134 of the tool head 108th

The attachment device 172 includes a one-way clutch 174.

The overrunning clutch 174 comprises, for example, a coupling element 178 arranged in a sleeve 176 which, depending on a direction of rotation 180 of the transmission shaft 130, establishes or releases a torque-transmitting connection relative to the tool receptacle 134.

By means of the free-wheeling clutch 174, a rotational drive of the tool holder 134 can thus be effected in a rotational direction 180 and at the same time be prevented from being transmitted back to the transmission shaft 130 in the opposite direction of rotation, for example due to torsional vibrations or the like.

By means of the overrunning clutch 174 can thus be reduced in particular the unwanted transmission of torsional vibrations to the holding device 102 or avoided altogether.

The attachment device 172 according to the fifth embodiment of the grinding machine 100 is suitable for use in any of the described embodiments of a grinding machine 100.

The fifth embodiment of the grinding machine 100 shown in FIG. 13 thus corresponds, with regard to the remaining structure and the remaining function, for example, to the one shown in FIGS. 2 to 5 illustrated second embodiment so that reference is made to the above description in this respect.

A sixth embodiment of a hand-held grinding machine 100 shown in FIGS. 14 to 16 essentially differs from the first embodiment shown in FIG. 1 in that the transmission shaft 130 and / or the casing 132 are relative to the holding device 102 and / or relative to the tool köpf 108 movable, in particular displaceable, are.

In the sixth embodiment of the grinding machine 100 shown in FIGS. 14 to 16, in particular two shaft receptacles 182 for receiving ends 184 of the transmission shaft 130 and / or for receiving ends 186 of the casing 132 are provided.

The ends 184 of the transmission shaft 130 and / or the ends 186 of the casing 132 are preferably displaceable relative to the respectively associated receptacle 182.

As in particular from a comparison of FIG. 14 to 16 show each other, in particular the ends 186 of the sheath 132 and one of the holding device 102 facing the end 184 of the transmission shaft 130 along a respective insertion direction 188 in the respective associated

Shaft receptacles 182 inserted and pulled out of the same.

In this case, the insertion direction 188 is in particular a main extension direction 190 of the transmission shaft 130 in the region of the respective shaft receiver 182.

As further also from a comparison of FIG. 14 to 16, the shroud 132 is slidable relative to the transmission shaft 130. The mobility of the transmission shaft 130 and the sheath 132, which is illustrated in FIGS. 14 to 16 and described above, in particular makes it possible to compensate the length of the transmission shaft 130 and the sheath 132 during pivoting of the tool head 108 relative to the holding device 102.

In particular, an undesirably strong bending of the transmission shaft 130 and / or the sheath 132 in the different pivot positions of the tool head 108 can thereby be avoided.

This ultimately reduces unwanted counterforces when pivoting the tool head 108, so that the grinding machine 100 is less heavily loaded in operation and more comfortable to handle by a user.

Incidentally, the in Figs. 14 to 16 illustrated sixth embodiment of the grinding machine 100 in terms of structure and function with the first embodiment shown in FIG. 1, so that reference is made to the above description thereof in this regard.

In other (not shown) embodiments of hand-held grinding machines 100, one or more features of the above-described embodiments of grinding machines 100 may be combined as desired.

For example, the movable receptacle of the transmission shaft 130 and / or the casing 132 according to the sixth embodiment of the grinding machine 100 shown in FIGS. 14 to 16 can be used to develop the second embodiment of the grinding machine 100 shown in FIGS. 2 to 5. LIST OF REFERENCE NUMBERS

100 hand-held grinder

102 holding device

104 drive motor

106 tool

108 tool head

110 handle

112 tubular rod

114 pipe element

116 proximal end

118 movement device

120 distal end

122 fork element

124 swivel ring

126 pivot axis

127 fork arm

128 swivel device

130 transmission wave

132 sheathing

134 tool holder

136 Rotational device

138 shifting device

140 bearing point

142 cones

144 guide channel

146 guide device

148 gear device

150 racks device

152 gear element

154 advantage

156 rack element

158 coupling element 160 coupling device

162 joint device

164 multi-joint device

166 joint

168 component

170 rotation axis

171 lever device

172 connection device

174 overrunning clutch

176 sleeve

178 coupling element

180 direction of rotation

182 wave recording

184 End of transmission shaft

186 End of the jacket

188 insertion direction

190 main direction of extension

A distance

Claims

Patent claims

1. Hand-held grinding machine (100), comprising a holding device (102) for holding the grinding machine (100), a drive motor (104) and a tool head (108), the tool head (108) being movable on the by means of a movement device (118). Holding device (102) is arranged, wherein by means of the movement device (118) the tool head (108) can be pivoted relative to the holding device (102) about one or more pivot axes (126) and wherein by means of the movement device (118) a distance (A) of the Tool head (108) can be varied by the holding device (102).

2. Grinding machine (100) according to claim 1, characterized in that by means of the movement device (118) by pivoting the tool head (108) about one or more pivot axes (126), the distance (A) of the tool head (108) from the holding device (102 ) can be varied.

3. Grinding machine (100) according to one of claims 1 or 2, characterized in that by means of the movement device (118) a distance (A) of a bearing point (140) of the tool head (108) arranged on a fork element (122) from a distal end (120) of the holding device (102) can be varied.

4. Grinding machine (100) according to one of claims 1 to 3, characterized in that the movement device (118) has a rotation device (136) for pivoting the tool head (108) about one or more pivot axes (126) and a displacement device (138). Displacing the tool head (108) relative to the holding device (102).

5. Grinding machine (100) according to one of claims 1 to 4, characterized in that the movement device (118) has a displacement Device (138) for displacing the tool head (108) relative to the holding device (102), the displacement device (138) being integrated into a fork element (122) of the grinding machine (100).

Grinding machine (100) according to one of claims 1 to 5, characterized in that the movement device (118) has a coupling device (160) designed as a gear device (148) and / or rack device (150) for positively coupling the pivoting movement of the tool head (108) with the Movement of the tool head (108) to change the distance (A) from the holding device (102).

Grinding machine (100) according to one of claims 1 to 6, characterized in that the movement device (118) comprises a guide device (146), in particular a guide channel (144), along which the tool head (108) to change the distance (A) can be moved by the holding device (102).

Grinding machine (100) according to one of claims 1 to 7, characterized in that the movement device (118) comprises a multi-joint device (164) which has two or more axes of rotation (170) running parallel to one another.

Grinding machine (100) according to claim 8, characterized in that the multi-joint device (164) is a positively coupled multi-joint device (164), in which a change in an angular position of a joint (166) of the multi-joint device (164) causes a change in an angular position of a further joint (166 ) of the multi-joint device (164), in particular all other joints (166) of the multi-joint device (164).

10. Grinding machine (100) according to one of claims 1 to 9, characterized in that the movement device (118) comprises a lever device (171) by means of which the tool head (108) can be pivoted into predetermined pivoting orientations.

11. Hand-held grinding machine (100), in particular according to one of claims 1 to 10, comprising a holding device (102) for holding the grinding machine (100), a drive motor (104) and a tool head (108), the tool head (108) being by means of a movement device (118) is movably arranged on the holding device (102), a tool holder (134) of the tool head (108) being coupled to the drive motor (104) by means of a transmission shaft (130), the grinding machine (100) having at least one connection device (172) for the torque-transmitting connection of the transmission shaft (130) to the drive motor (104) and/or to the tool holder (134) of the tool head (108), the connection device (172) comprising a one-way clutch (174) for torque transmission in only one direction of rotation (180).

12. Hand-held grinding machine (100), in particular according to one of claims 1 to 11, comprising a holding device (102) for holding the grinding machine (100), a drive motor (104) and a tool head (108), wherein the tool head (108) by means a movement device (118) is movably arranged on the holding device (102), a tool holder (134) of the tool head (108) being coupled to the drive motor (104) by means of a transmission shaft (130), the grinding machine (100) having two shaft holders ( 182) for receiving two ends (184) of the transmission shaft (130) and/or two ends (186) of a casing (132) of the transmission shaft (130), wherein at least one end (184) of the transmission shaft (130) and/or at least an end (186) of the casing (132) is movable relative to the associated shaft holder (182).

13. Grinding machine (100) according to claim 12, characterized in that at least one end (184) of the transmission shaft (130) and / or at least one end (186) of the casing (132) along a main extension direction (190) of the transmission shaft ( 130) is movable in an area of the associated shaft receptacle (182) relative to the associated shaft receptacle (182).

14. Grinding machine (100) according to one of claims 12 or 13, characterized in that the casing (132) and the transmission shaft (130) are displaceable relative to one another.

15. Grinding machine (100) according to one of claims 12 to 14, characterized in that a shaft receptacle (182) on the tool head (108) and / or a shaft receptacle (182) on a distal end (120) of a substantially tubular rod ( 112) of the holding device (102) is arranged.